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Tires are one of the easiest mods. I went from 185/60/14 to 185/75/14 on my 94 Sentra. I'd guess my mileage has been about 5 mpg better. The first year on the original size tires was 35 mpg. With the tire change my mileage calculations remained the same 35 mpg but the taller tire requires a correction factor. I divide my speed or mileage by 0.93 since I covered 100 miles on the interstate many times while only recording 92.4 miles on the odometer. The only time I've gotten worse than 40 mpg since 2020 was two long trips on the interstate at 80 mph with the air conditioner running most of the time.
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